Introduction: Obstacle Detector Wrist Band for Visually Impaired People

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In a world where colossal technological advancements are taking place to make lives as easier and smarter for the visually impaired as is for others, we, at STEMpedia, decided to come up with a simple project to help them in their daily lives. The DIY smart hand for blind will alert them of any objects that might be in their way thus helping them avoid those obstacles. To make it possible, all you need is an ultrasonic distance sensor, some 3D printed parts, wires, velcro, and you best bud evive!

Hop on board quick for we’re beginning!

Step 1: Components Needed


  • evive
  • Ultrasonic Sensor
  • Velcro
  • Jumper Cables
  • 3D Printed Part


  • Arduino IDE

Step 2: Making of the Wrist Band

We will be making the wrist band using Ultrasonic Sensor and a 3D Printed Part.

You can make the similar 3D printed part for yourself from the file given below.

Take the 3D Printed part and the ultrasonic sensor.

Fix the Ultrasonic Sensor into the 3D printed part.

Once done, take a small part of the velcro or the size of the wrist. And wrap this through the spaces given into the 3D printed part.

Step 3: Making the Arm Band

Take strips of velcro and fix them at the back of evive using nuts and bolts.

Thus, one need not carry the evive, they can just tie it to the arm and are ready to go.

Step 4: Connections

Once done with the making, make the connections as shown in the figure.

  • VCC: +5V of evive
  • GND: GND of evive
  • Trigger: Digital Pin9
  • Echo: Digital Pin10

Step 5: Code

Upload the following code to evive.

Step 6: Working

The ultrasonic sensor will detect the obstacles coming in the way. And if the object is detected, the inbuilt buzzer of evive will start buzzing indicating that one needs to be aware of the obstacle.

You can also change the range in which the ultrasonic sensor should detect using the potentiometer of evive.

You may notice the maximum distance set by you as well as the value of the potentiometer on the TFT Screen. The objects nearer to the maximum distance will be detected.

Step 7: Conclusion

With this, your DIY smart hand band for the blind all set to help those in need!

Before you leave, here’s a quick reminder that our launch is closing in! To know more about it, visit here!